JDW
Miller, I have a WW Greener, circa 1892 that has 13 on the receiver. Am I correct in your saying that it was not a .710 bore, as there are no other numbers there?
The 13 for the bore would not be marked on the receiver, but thr bbls. If the bbls are marked 13 then in 1892 this would mean that a plug gage (Ground or polished steel bar) of .710" diameter would enter the bore, but one of .719" (13/1) would not enter. It could not be stated exactly what it measured originally, other than it would have been within those limits. If the bore is subsequently enlarged to the point it will accept the .719" gage then it has become out of proof.
